Yeah, that is obviously not real.
However, contrary to popular belief, Great White Sharks do, in fact, leap out of the water. Something to do with the way they kill their prey. They tend to try to come up from directly below their target, propelling the target and themselves out of the water. This way the animal the great white is trying to get has a chance of being knocked unconscious when it smacks into the water's surface.
My friend goes on those offshore fishing trips here in So Cal. He says that the great whites almost completely clear the surface of the water when they leap up like that.
It is not in their nature to attack humans though. I suppose if one was desperate enough, it might try to attack a human, or if was a man-eater. In other words, if it had killed a human before, it might potentially label humans as part of its prey and intentionally attack people. Most shark attacks tend to bite people out of curiousity, that's why they only bite once and then swim away.
So yeah, although this photo is fake, and it is extremely unlikely that something like this would ever happen, I would not write the possibility off completely.

Last edited by Rowde on Fri Aug 02, 2002 4:51 pm, edited 1 time in total.

Copernicus of the New Age, take this unbearable weight of gravity, and liberate this galaxy!"
~ Kenji Miyazawa

It was not discovered to be a hoax due to its appearance, in fact it was very well done, but rather because the real photograph (reversed and minus one shark) also exists (I think someone posted it, even though I didn't check the link). Oh, and many types of sharks will shoot out of the water in a way like this to get meat (e.g. on a boat attempting to capture them for one reason or another).